Journal ArticleDOI
Lower hybrid acceleration and ion evolution in the suprauroral region
Tom Chang,Bruno Coppi +1 more
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TLDR
In this article, it was shown that the accelerated portion of the ions of ionospheric origin in the suprauroral region of the magnetosphere can evolve into conic distributions and propagate upwards along the field lines.Abstract:
It is shown that ions can be accelerated perpendicularly to the magnetic field lines by resonant interactions with lower hybrid modes. Taking into account the effects of the magnetic field inhomogeneity, we demonstrate that the accelerated portion of the ions of ionospheric origin in the suprauroral region of the magnetosphere can evolve into conic distributions and propagate upwards along the field lines. Thus these ions can reach the region where they can be strongly energized along the field lines by the electrostatic shocks. We can argue that the ion distribution resulting from the combination of these accelerated ions with the background ions can depart significantly from a thermal distribution and lead to the excitation of electrostatic ion cyclotron modes.read more
Citations
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Journal ArticleDOI
The physics of double layers and their role in astrophysics
TL;DR: In this article, the existence criteria for electrostatic double layers (DLs) are discussed, and the results of theoretical, simulation and observational investigations of magnetospheric DLs are presented.
Journal ArticleDOI
Spectroscopic Constraints on Models of Ion Cyclotron Resonance Heating in the Polar Solar Corona and High-Speed Solar Wind
TL;DR: In this paper, a theoretical model of the nonequilibrium plasma state of the polar solar corona is presented, where the primary energy deposition mechanism is the dissipation of high-frequency (10-10,000 Hz) ion cyclotron resonant Alfven waves.
Journal ArticleDOI
Transverse acceleration of oxygen ions by electromagnetic ion cyclotron resonance with broad band left‐hand polarized waves
Tom Chang,Geoffrey B. Crew,Noah Hershkowitz,J. R. Jasperse,John M. Retterer,J. D. Winningham +5 more
TL;DR: In this article, it is suggested that the observed broad band electric field fluctuations in the frequency range between 0 and 100 Hz can be responsible for the transverse energization of the ions through cyclotron resonance heating with the left-hand polarized electromagnetic waves.
Journal ArticleDOI
Ion energization mechanisms at 1700 km in the auroral region
Mats André,Patrik Norqvist,Laila Andersson,Lars Eliasson,Anders Eriksson,Lars Blomberg,Robert E. Erlandson,Joakim Waldemark +7 more
TL;DR: In this article, the Freja satellite at altitudes around 1700 km in the high-latitude magnetosphere is used to study ion energization perpendicular to the geomagnetic field.
Book ChapterDOI
Theories and Observations of Ion Energization and Outflow in the High Latitude Magnetosphere
Mats André,Andrew W. Yau +1 more
TL;DR: In this article, a review is given of several mechanisms causing outflow at high latitudes of ionospheric ions to the terrestrial magnetosphere, including polar wind, bulk ion outflow in the auroral region, upwelling ions and ion conics and beams.
References
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Journal ArticleDOI
Satellite measurements and theories of low altitude auroral particle acceleration
TL;DR: In this article, the S3-3 satellite results on DC electric fields, field-aligned currents, and waves are described, interpreted theoretically, and applied to the understanding of auroral particle acceleration at altitudes below 8000 km.
Journal ArticleDOI
Observation of an ionospheric acceleration mechanism producing energetic (keV) ions primarily normal to the geomagnetic field direction
TL;DR: In this article, O/sup +/ ions with energies of approximately 1 keV have been observed flowing upward out of the ionosphere with a pitch angle distribution having a minimum along the magnetic field direction and maxima in about 130/sup 0/--140/Sup 0/ range.
Journal ArticleDOI
The distribution of ion beams and conics below 8000 km
TL;DR: In this article, the authors made a distinction between ion distributions having peak fluxes along B (beams) and those exhibiting flux maxima that are not field-aligned (conics) and showed that both beams and conics are common auroral phenomena, whose frequencies of occurrence in latitude, local time, and altitude have a marked dependence on magnetic activity.
Journal ArticleDOI
The latitudinal, diurnal, and altitudinal distributions of upward flowing energetic ions of ionospheric origin
TL;DR: In this article, the upward acceleration of ionospheric ions to keV energies is a persistent phenomenon generally occurring in a zone closely associated with the statistical auroral oval, and the frequency of upward flowing ion events with flux above ∼2 × 106 keV/(cm² sec ster keV) is observed in more than 60% of the orbits.
Journal ArticleDOI
Simultaneous observations of energetic (keV) upstreaming and electrostatic hydrogen cyclotron waves
Paul M. Kintner,Michael C. Kelley,R. D. Sharp,A. G. Ghielmetti,M. Temerin,Cynthia A Cattell,P. F. Mizera,J. F. Fennell +7 more
TL;DR: In this paper, a comparative study of upstreaming energetic ions in the kilovolt energy range and electrostatic hydrogen cyclotron (EHC) waves has been made using the ion mass spectrometer and plasma wave receiver data sets for the first 1200 orbits of the S3-3 spacecraft.